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One of the major misconceptions about correlation is that a relationship between two variables means causation; that is, one variable causes changes in the other variable. There is a particular tendency to make this causal error, when the two variables seem to be related to each other.
What is one instance where you have seen correlation misinterpreted as causation? Please describe.
there are 300 homes in winetree subdivision. the subdivision committee decided to paint a third of the houses magenta
When might someone prefer mode over mean or median to describe a data set's central tendency? When is the median preferred over the mean to describe a variable?
A researcher computes the regression equation for a sample of n = 25 pairs of scores, X and Y values. If an analysis of regression is used to test the signifi- cance of the equation, what are the df values for the F-ratio?
Conditions 2 and 3 needed for the sampling distribution of P^ to be approximately normal are met because this result is based on a large random sample of adults. Explain how Condition 1 is also met.
Beyond the variables discussed, can you think of any others that might be relevant when creating a blended sample?
Let X be the number of accounts in the sample that are in error. Is X binomial? If not, what distribution does it have? Explain.
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study and gender differences were also to be investigated. One of the variables measured was the heart rate after..
What is the cumulative incidence of measles in this population? What is the incidence rate of measles? What is the prevalence of measles on July 1?
What is the domain of a quadratic function? Can you give an example please.
1. What proportion of the scores in a normal distribution are higher than a T-score of 70?
According to the Three-Legged Stool of Total Quality - Which of the following is a trend that will shape the future of quality management?
i) Use the CLT to construct a con?dence interval for m with approximate con?dence coef?cient 1 - a; ii) What does this interval become if n = 100, s = 1 and a = 0.05? iii) Refer to part (i) and determine n so that the length of the con?dence interval..
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